Accelerator for caoutchouc



Patented Sept. 22, 1931 UNITED ST TES PATENT OFFICE Hm LOMMEL, OF WIESDOBF-ON-THE-QHIHE, THEODOB GOOST, OF LEVERKUSEN- ON-THE-BHINE, AND HEBMLANN FRIEDRICH, OF WIESDORIErON-THE-BEINE, GEE- I MANY, ASSIGNORS TO I. G. I'ABBENINDUSTBIE AKTIENGESELLSOHAFT, 0] ram- IBORT-ON-THE-MAIN, GERMANY, A CORPORATION OF GER-KANT ACCELERATOR FOR CAOUTCHOUC No Drawing. Application fled December 15, 1927, Serial No. 240,331, and in Germany November 8, 10.7.

The present invention concerns a process for the manufacture of vulcanized natural rubber or synthetic rubber-like masses, which vulcanizates will be designated hereinafter as vulcanized rubber compounds, which consists in effecting the vulcanization in the presence of compounds of the following type N-X a, in which R, signifies an alicyclic residue (see Bernthsen, Lehrbuch der or anischen Chemie XVI Aufl. (1924) page 366 especially a cyclohexyl residue, which is connected with nitrogen directly or by means of one or more carbon atoms and R a hydrocarbon residue such as an alicyclicgroup, which is connected directly or indirectly with N, or alkyl and aralkyl with a straight or branched chain or aryl, which themselves may be linked up with B, so as to 'form a ring configuration. In order to illustrate our invention we give the formulas of some compounds containing the typical group mm mm Derivative o! the deeahydmqulnoline 'cyelohexylmethy Ha Ha monovalent residue such as :-hydrogen itself or in combination with an aldehyde or an acid especially a weak acid such as carbonic acid, hydrogen sulfide and the like, the group The vulcanization of the rubber compounds may be effected in the usuai manner, the compounds in question being used as such or in solutions.

The following examples will illustrate our invention:

Ewcmple L-A mixture of 100 parts of crude rubber, 10 parts of zinc white, 1 part of decehydrcquinaidine the probable and 5 parts of sulfur is vulcanized for 30 minutes at a pressure of 3 atmospheres. The vulcanized product shows remarkable resistance to tearing.

Example 2.A mixture of 100 parts of crude rubber, 10 parts of zinc white, 2.5 parts of sulfur and 0.5 parts of the zinc salt of the cyclohexylethyldithiocarbamic acid of the probable formula is vulcanized for 20 minutes at a pressure of 2 atmospheres. The vulcanized product has the considerable tenacity of 170 kg. per sq.

cm. at an extension of 700%.

Exam Ze '3.-A 30% benzene solution 1s prepare for dip ing from a mixture of 100 parts of crude ru ber, 2.5 arts of sulfur and 2.5 parts of zinc hydroxl e. when the dipping of the articles to be vulcanized has been completed, the products are heated to 75 C. for about one hour in a 1 5% aqueous solution of the cyclohexylethglamine salt of cyclohexylethyl-dithio-car amic acid of the probable formula m m H H: H H m N--c-s-'- a dim I dam A completely vulcanized product is thus obtained possessing very mechamcal prop-- erties. Insteadof the cycloheylethylamme salt other salts of the dithiocarbamic acid may be employed such as for instance the sodium salt.

Exam/pl? 4.-A mixture of 100 parts of crude rubber, 3 parts of sulfur, 5 parts of zinc white, 0.65 parts of thiurame disulfide of decahydroquina dine of the probable formula H Ha H: H

' the considerable tenacity of 17 0 kg. per sq. cm. at an extension of 760%.

Example -5.-A mixture of 100 parts of.

crude rubber, 3 parts of sulfur, 5 parts of zinc white, 0.55 arts of thiurame monosulfide of cyclohexy ethylamine of the probable formula HQHI Hall:

is vulcanized during 15 minutes at a pressure wherein R means an alicyclic residue, 3/ means one of the numbers 1 or 2 and R stands for a hydrocarbon residue, which may be linked up with R to form a ring configuration. a

2. Process for the manufacture of vulcanized rubber compounds which consists in effecting the vulcanization in the presence of a compound of the probable formula:

R N-O--S o N B Ba wherein R means an alicyclic residue, 3 means one of the numbers 1 or 2 and R stands for a h drocarbon residue of the group consisting o alicyclic and alkyl residues, which may be linked up with R to form a ring configuration.

3. Process for the manufacture of vulcanized rubber compounds which consists in effecting the vulcanization in the presence of a compound of the probable formula:

3 B1 N(l38- 84i-N wherein R means an alicyclic residue and R, stands for an alkyl residue containin from 3 to 4 carbon atoms which is linke up with R to for a ring configuration.

5. Process for the manufacture of vulcanized rubber compounds which consist in effecting the vulcanization in the presence of acompound of the probable formula:

wherein Z stands for hydrogen or methyl.

6. As new products of manufacture, Vulcanized rubber compounds obtainable according to claim 1.

7. As new products of manufacture, vulcanized rubber compounds obtainable ac-- cording to claim 2.

8. As new products of manufacture, vulcanized rubber compounds obtainable ao-a cording to claim 3.

9. As new products-of manufacture, vulcanized rubber compounds obtainable according to claim 4.

10. As new products of manufacture, vulcanized rubber compounds obtainable according to claim 5.

11. Process for the manufacture of vulcanized rubber compounds which consists in effecting the vulcamzation in the presence of a compound of the probable formula:

wherein R means an alicyclic residue and R stands for an alkyl grou 12. Process for the manu acture of vulcanized rubber compounds which consists in effecting the vulcanization in the resence of thiurame monosulfide of cyc-lo exylethylamine of the probable formula:

HIE!

13. As new products of manufacture, vulcanized rubber compounds obtainable according to claim 11.

14. As new products of manufacture, vulcanized rubber compounds obtainable according to claim 12.

In testimony whereof we have hereunto set our hands.

WILHELM LOMlIEL. THEODOR GOOST. HERMANN FRIEDRICH. 

